diff --git a/src/project/types/website/website-llms.ts b/src/project/types/website/website-llms.ts
index 5b8431f31e..b6b801953d 100644
--- a/src/project/types/website/website-llms.ts
+++ b/src/project/types/website/website-llms.ts
@@ -24,16 +24,24 @@ import {
   websiteTitle,
 } from "./website-config.ts";
 import { inputFileHref } from "./website-shared.ts";
-import { isDraftVisible, isProjectDraft, projectDraftMode } from "./website-utils.ts";
+import {
+  isDraftVisible,
+  isProjectDraft,
+  projectDraftMode,
+} from "./website-utils.ts";
 import { resolveInputTargetForOutputFile } from "../../project-index.ts";
-import { Format } from "../../../config/types.ts";
+import { Format, Metadata } from "../../../config/types.ts";
+import { kWebsite } from "./website-constants.ts";
 
 /**
  * Compute the output HTML file path from the source file.
  * Uses inputFileHref to convert the relative source path to an HTML href,
  * then joins with the output directory.
  */
-function computeOutputFilePath(source: string, project: ProjectContext): string {
+function computeOutputFilePath(
+  source: string,
+  project: ProjectContext,
+): string {
   const outputDir = projectOutputDir(project);
   const sourceRelative = relative(project.dir, source);
   // inputFileHref returns "/path/to/file.html" - strip leading / and join with output dir
@@ -176,7 +184,10 @@ ${main.innerHTML}
  * Restores original code text (with annotation markers) and converts
  * the annotation definition list to an ordered list.
  */
-function preprocessAnnotatedCodeBlocks(doc: Document, container: Element): void {
+function preprocessAnnotatedCodeBlocks(
+  doc: Document,
+  container: Element,
+): void {
   // Restore original code text in annotated code blocks.
   // The llms-code-annotations.lua filter saves the original text
   // (before code-annotation.lua strips markers) as a data attribute.
@@ -301,8 +312,17 @@ export async function updateLlmsTxt(
     return;
   }
 
-  const siteTitle = websiteTitle(context.config) || "Untitled";
-  const siteDesc = websiteDescription(context.config) || "";
+  // Read resolved site title/description from the first output file's format
+  // metadata. The metadata markdown pipeline in website-meta.ts writes resolved
+  // values (with shortcodes expanded) back into format.metadata during per-page
+  // rendering, and these flow through to ProjectOutputFile.format.
+  const firstFileMeta = outputFiles.length > 0
+    ? outputFiles[0].format.metadata[kWebsite] as Metadata | undefined
+    : undefined;
+  const siteTitle = (firstFileMeta?.title as string) ||
+    websiteTitle(context.config) || "Untitled";
+  const siteDesc = (firstFileMeta?.description as string) ||
+    websiteDescription(context.config) || "";
   const baseUrl = websiteBaseurl(context.config);
   const draftMode = projectDraftMode(context);
 
@@ -338,7 +358,9 @@ export async function updateLlmsTxt(
       // Extract title from the format metadata or use filename
       const title = (file.format.metadata?.title as string) ||
         basename(file.file, ".html");
-      const relativePath = pathWithForwardSlashes(relative(outputDir, llmsPath));
+      const relativePath = pathWithForwardSlashes(
+        relative(outputDir, llmsPath),
+      );
       const filePath = baseUrl
         ? (baseUrl.endsWith("/") ? baseUrl : baseUrl + "/") + relativePath
         : relativePath;
diff --git a/src/project/types/website/website-meta.ts b/src/project/types/website/website-meta.ts
index b37985436e..b70ac230d6 100644
--- a/src/project/types/website/website-meta.ts
+++ b/src/project/types/website/website-meta.ts
@@ -431,6 +431,8 @@ const kTwitterDesc = "quarto-twittercarddesc";
 const kOgTitle = "quarto-ogcardtitle";
 const kOgDesc = "quarto-ogcardddesc";
 const kMetaSideNameId = "quarto-metasitename";
+const kMetaSiteDescId = "quarto-metasitedesc";
+
 function metaMarkdownPipeline(format: Format, extras: FormatExtras) {
   const resolvedTitle = computePageTitle(format);
 
@@ -504,7 +506,13 @@ function metaMarkdownPipeline(format: Format, extras: FormatExtras) {
     processRendered(rendered: Record<string, Element>, doc: Document) {
       const renderedEl = rendered[kMetaSideNameId];
       if (renderedEl) {
-        // Update the document title
+        // Write resolved title back into format.metadata so it flows
+        // through to ProjectOutputFile.format for post-render consumers
+        const siteMeta = format.metadata[kWebsite] as Metadata;
+        if (siteMeta) {
+          siteMeta[kTitle] = renderedEl.innerText;
+        }
+        // Update the og:site_name meta tag
         const el = doc.querySelector(
           `meta[property="og:site_name"]`,
         );
@@ -555,9 +563,32 @@ function metaMarkdownPipeline(format: Format, extras: FormatExtras) {
     },
   };
 
+  const siteDescriptionHandler = {
+    getUnrendered() {
+      const siteMeta = format.metadata[kWebsite] as Metadata;
+      if (siteMeta && siteMeta[kDescription]) {
+        return {
+          inlines: { [kMetaSiteDescId]: siteMeta[kDescription] as string },
+        };
+      }
+    },
+    processRendered(rendered: Record<string, Element>) {
+      const renderedEl = rendered[kMetaSiteDescId];
+      if (renderedEl) {
+        // Write resolved description back into format.metadata so it flows
+        // through to ProjectOutputFile.format for post-render consumers
+        const siteMeta = format.metadata[kWebsite] as Metadata;
+        if (siteMeta) {
+          siteMeta[kDescription] = renderedEl.innerText;
+        }
+      }
+    },
+  };
+
   return createMarkdownPipeline("quarto-meta-markdown", [
     titleMetaHandler,
     siteTitleMetaHandler,
     descriptionMetaHandler,
+    siteDescriptionHandler,
   ]);
 }
diff --git a/tests/docs/smoke-all/website/llms-txt-shortcode/.gitignore b/tests/docs/smoke-all/website/llms-txt-shortcode/.gitignore
new file mode 100644
index 0000000000..1252e77997
--- /dev/null
+++ b/tests/docs/smoke-all/website/llms-txt-shortcode/.gitignore
@@ -0,0 +1,9 @@
+/.quarto/
+*.html
+*.llms.md
+llms.txt
+search.json
+site_libs/
+*_files/
+
+**/*.quarto_ipynb
diff --git a/tests/docs/smoke-all/website/llms-txt-shortcode/_environment b/tests/docs/smoke-all/website/llms-txt-shortcode/_environment
new file mode 100644
index 0000000000..3ee57c7667
--- /dev/null
+++ b/tests/docs/smoke-all/website/llms-txt-shortcode/_environment
@@ -0,0 +1 @@
+LLMS_TEST_VAR="Resolved"
diff --git a/tests/docs/smoke-all/website/llms-txt-shortcode/_quarto.yml b/tests/docs/smoke-all/website/llms-txt-shortcode/_quarto.yml
new file mode 100644
index 0000000000..7613912ef7
--- /dev/null
+++ b/tests/docs/smoke-all/website/llms-txt-shortcode/_quarto.yml
@@ -0,0 +1,15 @@
+project:
+  type: website
+  output-dir: .
+
+website:
+  title: "Site Title {{< env LLMS_TEST_VAR >}}"
+  llms-txt: true
+  navbar:
+    left:
+      - href: index.qmd
+        text: Home
+
+format:
+  html:
+    theme: cosmo
diff --git a/tests/docs/smoke-all/website/llms-txt-shortcode/index.qmd b/tests/docs/smoke-all/website/llms-txt-shortcode/index.qmd
new file mode 100644
index 0000000000..a7b8707b54
--- /dev/null
+++ b/tests/docs/smoke-all/website/llms-txt-shortcode/index.qmd
@@ -0,0 +1,15 @@
+---
+title: "Home"
+_quarto:
+  render-project: true
+  tests:
+    html:
+      ensureLlmsTxtExists: true
+      ensureLlmsTxtRegexMatches:
+        - ["^# Site Title Resolved"]
+        - ["\\{\\{< env"]
+---
+
+## Test Content
+
+This tests that shortcodes in website.title are resolved in llms.txt.